Just bought the same trunk from the same seller, alpha. Can't wait to get it.
Obviously I'll wait till I actually install it before I judge, but based on your pics, I think I'm okay with the height of the Corbin trunk as is, but I agree it needs to be moved forward. I probably won't have passengers on long rides, but I do plan to do 'round the neighborhood rides with my 3 lil' ones, so I may want the box moved as far forward as possible, just shy of interferring with the saddlebags.